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Gaokao Math Practice Question

在 $\triangle A B C$ 中, 点 $D$ 在边 $A B$ 上, $B D=2 D A$. 记 $\overrightarrow{C A}=\vec{m}, \overrightarrow{C D}=\vec{n}$, 则 $\overrightarrow{C B}=(\qquad)$

  1. A.$3 \vec{m}-2 \vec{n}$
  2. B.$-2 \vec{m}+3 \vec{n}$
  3. C.$3 \vec{m}+2 \vec{n}$
  4. D.$2 \vec{m}+3 \vec{n}$

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